If all of a roofing company's 8 workers are required to staff 2 roofing crews, how many workers need to be added during the busy season in order to send 5 complete crews out on jobs?

12

Explanation

In order to find how many additional workers are needed to staff the extra crews you first need to calculate how many workers are on a crew. There are 8 workers at the company now and that's enough to staff 2 crews so there are \(\frac{8}{2}=4\) workers on a crew. 5 crews are needed for the busy season which, at 4 workers per crew, means that the roofing company will need \(5 \times 4 = 20\) total workers to staff the crews during the busy season. The company already employs 8 workers so they need to add 20 - 8 = 12 new staff for the busy season.

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